I have a 200 Dakota Sport 4x4 3.9 V6. It will not go into reverse. I checked linkage,fine. fluid, fine. No bad smell or color. It wants to move forward in the reverse position. Also there is no neutral unless the motor is turned off. It moves forward then as well.(In neutral,when running). I just bought a used tranny for $750.00 with more miles. (81000). Mine has 69,750. Dealer charged me $90.00 to tell me it's a internal problem. Big help! Said $3600.00 to rebuild! Any ideas here?